Examples of net.sf.saxon.om.ValueRepresentation

net.sf.saxon.om.ValueRepresentation
A ValueRepresentation is a representation of a Value. This is a marker interface used to represent the union of two classes: Value, and NodeInfo. Either of these two classes can be used to represent a value. The class is used primarily to represent the value of a variable.
This class is intended primarily for internal use, and should not be considered part of the Saxon public API.

        }


        // Otherwise evaluate the function


        context.setStackFrame(getStackFrameMap(), actualArgs);
        ValueRepresentation result;
        try {
            result = ExpressionTool.evaluate(getBody(), evaluationMode, context, 1);
        } catch (XPathException err) {
            err.maybeSetLocation(this);
            throw err;

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    public TailCall processLeavingTail(XPathContext context) throws XPathException {
        if (binding==null) {
            throw new IllegalStateException("saxon:assign binding has not been fixed up");
        }
        ValueRepresentation value = getSelectValue(context);
        if (value instanceof Closure) {
            value = SequenceExtent.makeSequenceExtent(((Closure)value).iterate());
        }
        if (binding instanceof GeneralVariable) {
            if (binding.isGlobal()) {

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     *          if a dynamic error occurs during evaluation of the function.
     */


    public Item evaluateItem(XPathContext context) throws XPathException {
        FunctionItem f = (FunctionItem)getArguments()[0].evaluateItem(context);
        ValueRepresentation val = SequenceExtent.makeSequenceExtent(
                getArguments()[1].iterate(context));
        int arg = 1;
        if (getNumberOfArguments() == 3) {
            arg = (int)((IntegerValue)getArguments()[2].evaluateItem(context)).longValue();
        }

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    }


    public Expression optimize(ExpressionVisitor visitor, ItemType contextItemType) throws XPathException {
        base = visitor.optimize(base, contextItemType);
        if (base instanceof Literal) {
            ValueRepresentation value =
                    SequenceExtent.makeSequenceExtent(iterate(visitor.getStaticContext().makeEarlyEvaluationContext()));
            return Literal.makeLiteral(Value.asValue(value));
        }
        return this;
    }

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    * only when the cardinality is zero or one. If the function is tail recursive,
    * it returns an Object representing the arguments to the next (recursive) call
    */


    public Item evaluateItem(XPathContext c) throws XPathException {
        ValueRepresentation val = callFunction(c);
        return Value.asItem(val);
    }

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    * Call the function, returning an iterator over the results. (But if the function is
    * tail recursive, it returns an iterator over the arguments of the recursive call)
    */


    public SequenceIterator iterate(XPathContext c) throws XPathException {
        ValueRepresentation result = callFunction(c);
        return Value.getIterator(result);
    }

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      *     expression; or null to indicate that the result is an empty
      *     sequence
      */


    public Item evaluateItem(XPathContext context) throws XPathException {
        ValueRepresentation actual = context.evaluateLocalVariable(slotNumber);
        return Value.asItem(actual);
    }

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    public SequenceIterator iterate(XPathContext context) throws XPathException {
        final XPathContextMajor cm = (XPathContextMajor)context;
        while (true) {
            SequenceIterator iter = operand.iterate(cm);
            ValueRepresentation extent = SequenceExtent.makeSequenceExtent(iter);
            UserFunction fn = cm.getTailCallFunction();
            if (fn == null) {
                return Value.asIterator(extent);
            }
            if (fn != containingFunction) {

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     * @throws XPathException if the variable is undefined
     */


    public SequenceIterator iterate(XPathContext c) throws XPathException {
        try {
            ValueRepresentation actual = evaluateVariable(c);
            return Value.getIterator(actual);
        } catch (XPathException err) {
            err.maybeSetLocation(this);
            throw err;
        } catch (AssertionError err) {

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        }
    }


    public Item evaluateItem(XPathContext c) throws XPathException {
        try {
            ValueRepresentation actual = evaluateVariable(c);
            if (actual instanceof Item) {
                return (Item) actual;
            }
            return Value.asItem(actual);
        } catch (XPathException err) {

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Related Classes of net.sf.saxon.om.ValueRepresentation

net.sf.saxon.expr.Assignation

net.sf.saxon.expr.AtomicSequenceConverter

net.sf.saxon.expr.LetExpression

net.sf.saxon.expr.SuppliedParameterReference

net.sf.saxon.expr.TailCallLoop

net.sf.saxon.expr.TailExpression

net.sf.saxon.expr.UserFunctionCall

net.sf.saxon.expr.VariableReference

net.sf.saxon.functions.PartialApply

net.sf.saxon.instruct.Assign

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